如何设置使用默认 Android 查看器查看保存在内部存储中的图像的意图？

发布于 2024-11-14 05:26:39 字数 915 浏览 1 评论 0原文

我想做的是从网络下载图像（它是 GIF 格式，如果这会改变任何内容）并将其显示在具有缩放/平移功能的屏幕上。我已成功将图像下载到 Bitmap 实例 myBitmap 中，但 ImageView 没有缩放功能。因此，我愿意为它提供具有缩放/平移功能的默认查看器。为了设置意图，我需要提供保存文件的 URI。因此，首先我将文件保存到内部存储中（还可以使用 MODE_WORLD_READABLE 访问其他应用程序）：

    try {
        FileOutputStream out = openFileOutput("scrible",
                Context.MODE_WORLD_READABLE);
        myBitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
    } catch (FileNotFoundException e) {
        Log.d(myTag, e.toString());
    }

然后我成功检查其真正可读：

    File myFile = new File(getFilesDir(), "scrible");
    if (myFile.canRead()) {
        Log.d(myTag, "Its readable");
    }

然后我尝试设置意图（这给了我错误：意外停止）：

    Uri fileUri = Uri.fromFile(myFile);
    startActivity(new Intent(Intent.ACTION_VIEW, fileUri));

我尝试设置单独启动意图，并且在调用 startActivity(intent); 之前不会给出错误；

我做错了什么？

原文

What I am trying to do is to download image from web (its in GIF format, if that changes anything) and show it on screen with zoom/pan capability. I've successfully downloaded image into Bitmap instance myBitmap, but ImageView doesnt have zooming feature. So instead I'm willing to present it with default viewer which has zoom/pan features. In order to set up intent I need to provide URI to saved file.
So first I save file into internal storage (also giving access to other apps withe MODE_WORLD_READABLE):

    try {
        FileOutputStream out = openFileOutput("scrible",
                Context.MODE_WORLD_READABLE);
        myBitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
    } catch (FileNotFoundException e) {
        Log.d(myTag, e.toString());
    }

Then I successfully check its really readable:

    File myFile = new File(getFilesDir(), "scrible");
    if (myFile.canRead()) {
        Log.d(myTag, "Its readable");
    }

Then I try to set up intent (which gives me error: stopped unexpectedly):

    Uri fileUri = Uri.fromFile(myFile);
    startActivity(new Intent(Intent.ACTION_VIEW, fileUri));

I've tried to set up intent separately and it doesnt give error antil call to startActivity(intent);

What I am doing wrong?

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月光色 2024-11-21 05:26:39

以下对我来说效果很好：

Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(outputFileName)),"image/jpeg");
startActivity(intent);

我看到的区别是您没有调用 setDataAndType 。

The following works well for me:

Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(outputFileName)),"image/jpeg");
startActivity(intent);

The difference that I see is that you do not call the setDataAndType.

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